Who has been buying Koei Tecmo Holdings Co., Ltd. stock?

19 distinct investors have filed 53 disclosed large-shareholding filings in Koei Tecmo Holdings Co., Ltd. (3635), most recently on 2026-01-09. Each filer, their role, the number of shares and the price at filing are listed in the table on this page.

How many insider filings does Koei Tecmo Holdings Co., Ltd. have?

Koei Tecmo Holdings Co., Ltd. has 53 buy-side and 31 sell-side disclosures on record, covering ¥257.6B ($1.7B) in total reported value, spanning 2021-04-07 to 2026-01-09.

Where does StockDrifts get Koei Tecmo Holdings Co., Ltd. insider data?

From EDINET large-shareholding (5%+) reports — the official filing system run by the Financial Services Agency (Japan). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from EDINET.

Do insider buys in Japanese stocks predict returns?

Not uniformly. StockDrifts scored 101,000+ Japanese large-shareholding filings on fixed 12-month forward returns and found the predictive power concentrated in specific filer types and filing patterns rather than spread evenly across all disclosures.

Koei Tecmo Holdings Co., Ltd. 3635

Company

株式会社コーエーテクモホールディングスKoei Tecmo Holdings Co., Ltd.

Investors

Buys

Total Value

¥257.6B ($1.7B)

Avg Return

-10.60%

Last Filing

2026-01-09

Koei Tecmo Holdings Co., Ltd. (3635) has 53 disclosed large-shareholding filings and 31 disclosed disposals on record, filed by 19 distinct investors. Together those filings cover ¥257.6B ($1.7B) in reported transaction value. The earliest filing StockDrifts holds for Koei Tecmo Holdings Co., Ltd. is dated 2021-04-07; the most recent is 2026-01-09. All of it is parsed from EDINET large-shareholding (5%+) reports, the official disclosure system operated by the Financial Services Agency (Japan). Across these filings the average return since disclosure is -10.60%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

Date	Type	Source	Insider	Purpose	Shares	Price at filing	Return	Value
2026-01-09	BUY	Market Buy	アヤル・ファースト・インベストメント・カンパニー(Ayar First Investment Company) Ayar First Investment Company	passive	31.3M	¥1,914	-8.9%	¥59.8B ($386.1M)
2026-01-09	SELL	Market Buy	パブリック・インベストメント・ファンド(Public Investment Fund) Public Investment Fund	passive	0	¥1,914	+8.9%	¥57.7B ($372.3M)
2025-09-18	BUY	negotiated	株式会社光優ホールディングス Mitsuyu Holdings Co., Ltd.	activist	173.2M	¥1,998.5	-12.7%	¥342.5B ($2.2B)
2025-09-18	BUY	negotiated	襟川亜衣 Ai Erigawa	activist	2.0M	¥1,998.5	-12.7%	¥4.0B ($25.8M)
2025-09-18	BUY	negotiated	襟川芽衣 Mei Erigawa	activist	2.0M	¥1,998.5	-12.7%	¥4.0B ($26.0M)
2025-09-18	BUY	negotiated	襟川恵子 Keiko Erigawa	activist	59.6K	¥1,998.5	-12.7%	¥6.7B ($43.3M)
2025-09-18	BUY	unknown	株式会社静文館 Seibunkan Co., Ltd.	strategic	1.0M	¥1,998.5	-12.7%	¥2.0B ($13.0M)
2025-09-18	BUY	unknown	株式会社清晨舘 Seishinkan Co., Ltd.	strategic	1.1M	¥1,998.5	-12.7%	¥2.2B ($14.2M)
2025-09-18	BUY	unknown	株式会社青悠社 Seiyusha Co., Ltd.	strategic	312.2K	¥1,998.5	-12.7%	¥624M ($4.0M)
2025-09-18	SELL	unknown	環境科学株式会社 Environmental Science Co., Ltd.	strategic	21.7M	¥1,998.5	+12.7%	¥6.9B ($44.6M)
2025-09-18	SELL	unknown	柿原康晴 Yasuharu Kakihara	strategic	1.2M	¥1,998.5	+12.7%	¥67M ($433K)
2025-09-18	SELL	unknown	柿原孝典 Takanori Kakihara	strategic	80.2K	¥1,998.5	+12.7%	¥20.2B ($130.0M)
2025-09-18	BUY	unknown	柿原健晴 Takeharu Kakihara	strategic	618.0K	¥1,998.5	-12.7%	¥1.2B ($8.0M)
2025-09-18	BUY	negotiated	襟川陽一 Erikawa Yoichi	activist	69.6K	¥1,998.5	-12.7%	¥139M ($898K)
2024-08-26	BUY	negotiated	株式会社光優ホールディングス Mitsuyu Holdings Co., Ltd.	activist	179.2M	¥1,590.5	+9.7%	¥5.3B ($34.5M)
2024-08-26	BUY	negotiated	襟川芽衣 Mei Erigawa	activist	2.0M	¥1,590.5	+9.7%	¥3.2B ($20.6M)
2024-08-26	BUY	negotiated	襟川陽一 Erikawa Yoichi	activist	50.8K	¥1,590.5	+9.7%	¥81M ($522K)
2024-08-26	BUY	negotiated	襟川亜衣 Ai Erigawa	activist	2.0M	¥1,590.5	+9.7%	¥3.2B ($20.5M)
2024-08-26	BUY	negotiated	襟川恵子 Keiko Erigawa	activist	40.6K	¥1,590.5	+9.7%	¥65M ($416K)
2024-07-11	BUY	negotiated	株式会社光優ホールディングス Mitsuyu Holdings Co., Ltd.	activist	175.9M	¥1,455	+19.9%	¥5.0B ($32.2M)
2024-07-11	BUY	negotiated	襟川芽衣 Mei Erigawa	activist	2.0M	¥1,455	+19.9%	¥2.9B ($18.9M)
2024-07-11	BUY	negotiated	襟川恵子 Keiko Erigawa	activist	40.6K	¥1,455	+19.9%	¥59M ($381K)
2024-07-11	BUY	negotiated	襟川陽一 Erikawa Yoichi	activist	50.8K	¥1,455	+19.9%	¥74M ($477K)
2024-07-11	BUY	negotiated	襟川亜衣 Ai Erigawa	activist	2.0M	¥1,455	+19.9%	¥2.9B ($18.8M)
2024-06-07	BUY	subscription	みずほインターナショナル Mizuho International plc	other	0	¥1,397.5	+24.8%	-
2024-06-07	SELL	subscription	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.5M	¥1,397.5	-24.8%	¥658M ($4.2M)
2024-06-07	BUY	subscription	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	3.5M	¥1,397.5	+24.8%	¥4.5B ($29.1M)
2024-05-22	BUY	subscription	みずほインターナショナル Mizuho International plc	other	0	¥1,376	+26.7%	-
2024-05-22	BUY	subscription	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.9M	¥1,376	+26.7%	¥1.3B ($8.7M)
2024-05-22	BUY	subscription	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	24.0M	¥1,376	+26.7%	¥33.0B ($212.7M)
2024-05-20	BUY	negotiated	株式会社光優ホールディングス Mitsuyu Holdings Co., Ltd.	activist	172.4M	¥1,418	+23.0%	¥524M ($3.4M)
2024-05-20	BUY	negotiated	襟川亜衣 Ai Erigawa	activist	2.0M	¥1,418	+23.0%	¥2.8B ($18.3M)
2024-05-20	BUY	negotiated	襟川芽衣 Mei Erigawa	activist	2.0M	¥1,418	+23.0%	¥2.9B ($18.4M)
2024-05-20	BUY	negotiated	襟川恵子 Keiko Erigawa	activist	40.6K	¥1,418	+23.0%	¥58M ($371K)
2024-05-20	BUY	negotiated	襟川陽一 Erikawa Yoichi	activist	50.8K	¥1,418	+23.0%	¥72M ($465K)
2024-04-22	BUY	subscription	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	24.0M	¥1,464	+19.1%	¥35.1B ($226.4M)
2024-04-22	BUY	subscription	みずほインターナショナル Mizuho International plc	other	0	¥1,464	+19.1%	-
2024-04-22	BUY	subscription	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.0M	¥1,464	+19.1%	¥4.3B ($28.0M)
2024-04-05	BUY	subscription	みずほインターナショナル Mizuho International plc	other	0	¥1,572	+10.9%	-
2024-04-05	SELL	subscription	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.0M	¥1,572	-10.9%	¥159M ($1.0M)
2024-04-05	BUY	negotiated	襟川芽衣 Mei Erigawa	activist	2.0M	¥1,572	+10.9%	¥3.2B ($20.4M)
2024-04-05	BUY	negotiated	襟川恵子 Keiko Erigawa	activist	40.6K	¥1,572	+10.9%	¥64M ($412K)
2024-04-05	BUY	negotiated	襟川陽一 Erikawa Yoichi	activist	50.8K	¥1,572	+10.9%	¥80M ($515K)
2024-04-05	BUY	negotiated	株式会社光優ホールディングス Mitsuyu Holdings Co., Ltd.	activist	172.0M	¥1,572	+10.9%	¥270.4B ($1.7B)
2024-04-05	BUY	negotiated	襟川亜衣 Ai Erigawa	activist	2.0M	¥1,572	+10.9%	¥3.1B ($20.3M)
2024-04-05	BUY	subscription	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	3.5M	¥1,572	+10.9%	¥5.0B ($32.4M)
2024-03-07	BUY	block_purchase	パブリック・インベストメント・ファンド(Public Investment Fund) Public Investment Fund	passive	30.1M	¥1,785.5	-2.3%	¥7.9B ($50.7M)
2024-02-08	BUY	block_purchase	パブリック・インベストメント・ファンド(Public Investment Fund) Public Investment Fund	passive	25.8M	¥1,799	-3.1%	¥6.4B ($41.3M)
2024-02-07	BUY	subscription	みずほインターナショナル Mizuho International plc	other	0	¥1,796.5	-2.9%	-
2024-02-07	SELL	subscription	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.1M	¥1,796.5	+2.9%	¥121M ($779K)

Showing the 50 most recent of 200 filings.

Frequently asked questions

Who has been buying Koei Tecmo Holdings Co., Ltd. stock?: 19 distinct investors have filed 53 disclosed large-shareholding filings in Koei Tecmo Holdings Co., Ltd. (3635), most recently on 2026-01-09. Each filer, their role, the number of shares and the price at filing are listed in the table on this page.
How many insider filings does Koei Tecmo Holdings Co., Ltd. have?: Koei Tecmo Holdings Co., Ltd. has 53 buy-side and 31 sell-side disclosures on record, covering ¥257.6B ($1.7B) in total reported value, spanning 2021-04-07 to 2026-01-09.
Where does StockDrifts get Koei Tecmo Holdings Co., Ltd. insider data?: From EDINET large-shareholding (5%+) reports — the official filing system run by the Financial Services Agency (Japan). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from EDINET.
Do insider buys in Japanese stocks predict returns?: Not uniformly. StockDrifts scored 101,000+ Japanese large-shareholding filings on fixed 12-month forward returns and found the predictive power concentrated in specific filer types and filing patterns rather than spread evenly across all disclosures.

Source filings

Every trade listed above is disclosed in EDINET large-shareholding (5%+) reports, filed with the Financial Services Agency (Japan). View the original EDINET filings for Koei Tecmo Holdings Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.